Pico vs Vi(m) read lock question

This is a discussion on Pico vs Vi(m) read lock question within the Linux Programming forums, part of the Platform Specific Boards category; The following places a read lock over cf.buffer Code: % lockf "/home/nh/cf.buffer" sleep 10000 & Now here' s what I'm ...

  1. #1
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    Pico vs Vi(m) read lock question

    The following places a read lock over cf.buffer

    Code:
    % lockf "/home/nh/cf.buffer" sleep 10000 &
    Now here' s what I'm mystified by. I run this and then i fire up the Vi(m) editor. The editor warns me that the file is read only and then refuses to let me modify the file. But when I dot he same thing with Pico, I get no warning and the Pico editor will not only let me write to cf.buffer but also save the changes.

    Why is this?
    Last edited by Overworked_PhD; 06-28-2009 at 05:00 PM.

  2. #2
    Cat without Hat CornedBee's Avatar
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    lockf places an advisory (or voluntary) lock, not a mandatory one. This means that applications that aren't aware of this form of locking (as pico apparently is) simply ignore it.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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